<div id="left-side" class="col-xs-1 col-md-2">
    <div class="panel panel-info">
        <div class="panel-heading">后台管理</div>
    </div>
    <div class="list-group nav-menu">
        <a class="list-group-item nav-menu-item" href="/main/userManage">
            <i class="fa-fw fa fa-user"></i>
            用户管理
        </a>
        <a class="list-group-item nav-menu-item" href="/main/machineManage">
            <i class="fa-fw fa fa-desktop"></i>
            机房管理
        </a>
        <a class="list-group-item nav-menu-item" href="/main/emailManage">
            <i class="fa-fw fa fa-envelope"></i>
            邮件管理
        </a>
    </div>


</div>